Several students in Mr. Samber's class have trouble keeping themselves on task during independent seatwork assignments. Mr. Samber gives each of these students a piece of paper on which they are to make a check mark every time they find themselves doing something other than their assignment during seatwork time. Mr. Samber is applying which one of the following concepts?
Self-monitoring
secondary reinforcers
mastery goal

Self monitoring

Explanation:

Several students in Mr. Samber's class have trouble keeping themselves on task during independent seatwork assignments. Mr. Samber gives each of these students a piece of paper on which they are to make a check mark every time they find themselves doing something other than their assignment during seatwork time. Mr. Samber is applying SELF MONITORING

world bank is the correct answer.

i would say b. research typically uses a variety of sources